Burglar-alarm



(No Model.)

G. WADE & J. O. BURRUSS.

BURGLAR ALARM.

Patented July 12, 1887.

Zia 21112221 650726222 We N. PETERS. PhnloLlkhogmphun Washingion. D. C

UNITED STATES PATENT OF ICE.

GILMAN YVADE, OF ST. LOUIS, MISSOURI, AND JOHN C. BURRUSS, OF OAR-ROLLTON, ILLINOIS.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 366,537, dated July 12,1887.

Application filed February 7, 1887. Serial No. 226,748.

To all whom it may concern.- Be it known that we, GILMAN WADE, of thecity of St. Louis, in the State of Missouri, and JOHN G. BURRUSS, ofCarrolltomin the county of'Grcene and State of Illinois, have inventedcertain new and useful Improvements in Burglar-Alarms, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, forming part of this specification, and inwhich- Figure I shows a door and 'doorframe with our improvementapplied. Fig. II is an enlarged view of the alarm removed from the door,and showing the bell removed and its stem in section. Fig. IIIis anenlarged view, being a horizontal section of part of the door andthrough part of the alarm, showing the remainder of the alarm in topview. Fig. IV is an enlarged perspective view of the operating-lever.Fig. V illustratesa modification of the lever.

Our invention relates to a burglar-alarm, to

be used on doors particularly, but which maybe used on money-drawers andother like places, if desired; and our invention consists in features ofnovelty, hereinafter fully described, and pointed out in the claims.

Referring to the drawings, 1 represents the door, and 2 the door-frame.

3 represents the latch, having an ordinary knob, 4. The knob is securedto the spindle 5, by a screw, 6, as usual, (see Fig. V,) and secured tothe spindle 5 is a lever, 7, the lever having a socket, 8, fitting overthe spindle. 5 The spindle being square and the socket in the lever 7being square, thelever is made to turn with the spindle.

9 represents a cord orchain secured to the outer end of the lever 7 atone end, and se- 0 cured by its other end to a projection, 10, ofahammer, 11. The hammer is pivoted to a disk, 12, secured to the door bya screw, 13, the plate having ahollow stem, 14, through which the screwpasses, and preferably having alug, 15, that engages with the door toprevent it from turning. (See Fig. Ill).

The hammer 11 is pivoted to the plate 12 by a screw, 16, as shown inFig. II, and is held cocked or is forced down by one and the sameC-shaped spring, 17, which has one end so- (No model.)

cured to the plate 12 at 18, and bears at its other end in a socketformed in an enlargement or spur, 19, projecting from the side of thehammer. The position of the fixed end 18 of the spring 17 is such thatsaid spring will constantly exert its pressure, when the hammer is incocked position aboutin a line drawn through the pivotal point of thehammer, as indicated at 44 in Fig. II-that is to say, its pressure isexerted constantly toward the pivot 16,'by which it is sustained. Theeffect of this arrangement is that the spring will have a constanttendency to elevate or lower the hammer accordingly asits free extremityis on the one or the other side of the line 44. Projecting from thehammer in a direction which is about radial with respect to its centerof motion and at an angle of about forty degrees with respect to thespur19, is aheel, 10, to which the chain 9is secured. This arrangementissuch that when the extremity of the spring 17 is on that side of theline 44 which causes it to exert its influence to raise the hammer theextremity of the heel will impinge against the spring 17, and therebyform a stop for limiting the extent to which the hammer shall be raised,as indicated in Fig. II. \Vith the parts in the position shown in thisfigure it will be seen that when the hammer is moved by a pull on thechain until the socket in the extremity of the spur 19 (and consequentlythe free extremity 17 (as We have shown it) with relation to the pivotof the hammer a simple form of spring may be used, both for holding thehammer in its cocked position and for forcing it forward to explode thecartridge.

The spring, hammer, and cartridge are preferabl y hidden from view by abell-shaped disk, 21, secured to the outer end of the stem 14 by meansof the screw 13, the object being to hide the spring, cartridge, andhammer and to give to the device the appearance of an ordinarydoor-bell, so as to avoid disfiguring the door.

There may be used (and we prefer to use) in connection with the alarm,as described, a candle, 22, supported in a holder, 23, on a plate, 24.The plate is secured to the door near the alarm, and we have shown itsecured by it being placed behind the plate 12, or between the plate 12and the door, so that the screw 13 passes through it. In addition tothis support it may be fastened by means of screws 25 at its lower end.The end of the candle is located in line with the cartridge, so thatwhen the latter is exploded the flame will come in contact with theexplosive end 26 of the candle, whereby the latter is lighted toilluminate the room at the same time the alarm is given.

As a modification of the lever 7, the chain or cord 9 may be secured tothe shank of the door-knob by means of the screw 6, as shown in Fig. V,the chain having an extension, 9, which is doubled back and fastened tothe main part 27. \Vith this arrangement (as with the other) it will beseen that when the doorknob is turned in either direction the chain 9will be pulled downward to trip the hammer.

We claim as our invention- 1. In a burglar-alarm, the combination of thecartridge-holder, the pivoted hammer, the pivot on which it is mounted,a spring exerting its pressure when thehammeris in cocked position aboutin a line drawn through its pivotal point, a spur projecting laterallyfrom the hammer and upon which said spring bears, a heel projecting fromthe hammer at an angle to said spur, and the pull-chain connected tosaid heel, substantially as set forth.

2. In a burglar-alarm, the combination of the cartridge-holder, thepivoted hammer having a spur projecting therefrom in a direction radialto its pivotal point, the pivot on which the hammer is mounted, aC-sha'ped spring having its free end in engagement with said spur, andits fixed end so located that the spring will exert its pressure whenthe hammer is in cocked position about in a line drawn through thepivotof the hammer,and a pull-chain connected to the hammer,substantially as set forth.

3. In a burglar-alarm, the combination of the cartridge-holder, thepivoted hammer hav ing a spur projectingtherefrom in a direction radialwith respect to its pivotal point, the pivot on which the hammerismounted, a spring engaging said projection and exerting its pressurewhen the hammer is in cocked position about in a line drawn through thepivot and the fixed end of the spring, the pivot of the hammer, wherebythe latter is elevated or depressed accordingly as the said spur is onone or the other side of the line in which the spring exerts itspressure, and a stop for limiting the upward movement of the hammer,substantially as set forth.

4. In a burglar-alarm, thecombination of the cartridge-holder, thepivoted hammer having a spur projecting from the hammer radially withrespect to its pivotal. point, having a socket and a heel projectingfrom said hammer at an angle with relation to the spur, the pivot onwhich the hammer is mounted, a C- shaped spring having its free end inengagement with the socket in said spnr,and its fixed end so situatedthat the spring will exert its pressure when the hammer is in cockedposition about in a line drawn through toward the pivot of. the hammer,the parts being so proportioued' and arranged that the heel of thehammer will impinge againstthe spring and thereby form a stop forlimiting the upward movement of the hammer, substantially as set forth.I

5. In a burglar-alarm, the eombination,with the plate 12, havingthecartridge-holdcr and the firing mechanism secured thereto, of thehollow stem 14, the bell-shaped cap 21, placed upon said stem so as toconceal the working parts of the device, and the screw 13, passingthrough said cap and stem and engaging the wood-work whereby the partsare secured togcther, substantially as set forth.

6. The combination, with the cartridge-- holder and the firingmechanism, of the candle 22, having the explosive end 26, situatedopposite the discharge end of the cartridge, the candleholder 23, andthe plate 24, placed against the wood-work opposite the candle andcartridge for protecting said wood work from smoke or heat,substantially as set forth.

GILMAN \VADE. JOHN C. BURRUSS.

In presence of GEo. H. KNIGHT, EDW. S. KNIGHT.

